TS4995EIJT STMicroelectronics, TS4995EIJT Datasheet - Page 20

• Manufacturer Part Number: TS4995EIJT
• Description: IC AMP AUDIO PWR 1.2W 9FLIPCHIP
• Manufacturer: STMicroelectronics
• Type: Class ABr

Specifications of TS4995EIJT

• Output Type: 1-Channel (Mono)
• Max Output Power X Channels @ Load: 1.2W x 1 @ 8 Ohm
• Voltage - Supply: 2.5 V ~ 5.5 V
• Features: Depop, Differential Inputs, Standby, Thermal Protection
• Mounting Type: Surface Mount
• Package / Case: 9-FlipChip
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-6101-2

Application information
4.5
4.6
20/26
Decoupling of the circuit
Two capacitors are needed to correctly bypass the TS4995: a power supply bypass
capacitor C
The C
and an indirect influence on power supply disturbances. With a value for C
expect THD+N performance similar to that shown in the datasheet.
In the high frequency region, if C
disturbances on the power supply rail are less filtered.
On the other hand, if C
rail are more filtered.
The C
PSRR performance (with grounded input and in the lower frequency region).
Wake-up time t
When the standby is released to put the device ON, the bypass capacitor C
immediately. Because C
properly until the C
time or t
the TS4995 gain is close to zero. After the wake-up time, the gain is released and set to its
nominal value.
If C
corresponding wake-up time.
Figure 57. Startup time vs. bypass capacitor
b
has a value different from 1 µF, then refer to the graph in
S
b
capacitor has an influence on the THD+N at lower frequencies, but also impacts
capacitor has particular influence on the THD+N at high frequencies (above 7 kHz)
WU
S
and is specified in
and a bias voltage bypass capacitor C
b
voltage is correct. The time to reach this voltage is called the wake-up
WU
S
15
10
5
0
b
0.0
is greater than 1 µF, then those disturbances on the power supply
is directly linked to the bias of the amplifier, the bias will not work
Tamb=25
Vcc=2.6V
Table 4 on page
S
0.4
°
is lower than 1 µF, then THD+N increases and
C
Bypass Capacitor Cb (
Vcc=5V
0.8
Vcc=3.3V
5, with C
1.2
b
.
b
μ
=1 µF. During the wake-up phase,
F)
1.6
Figure 57
2.0
to establish the
S
of 1 µF, one can
b
is not charged
TS4995